Planoqraph co



Patented' July 1, 1919.

THB COLUMNA PLANDGRAPH C0., WASHINTDN. n. C.

UNITED STATES PATENT oFFIoE.

eIDEON PILLOW BROWN, OF LAKE FOREST, ILLINOIS, AssfIeNoaTo BLANCHE WEIGHT y I BROWN, OF LAKE BLUFF, ILLINOIS.

HAND-HOLE scRAPEIt.

Specification of `Letters Patent.

1 y Patentealulyi, 1919.

Application :filed February 9, 1914, SerialNo. 817,454. Renewed November 8, 1918,. Serial No. 261,716.

To all whom t may concern:

Be it known that I, GIDEON PILLo BROWN, America, and resident of Lake Forest, Lake and luseful improvement in I-'Iand-Hole Scrapers, of whichthe following is a specification.

My invention relates to Scrapers in general, but more particularly to boiler hand hole scrapersofthe kind disclosed in my prior application No. 798,423. In a scraper of this particular character, the blades are automatically moved toward and away from the axis of rotation, in order that theymay follow the oval line of the hand hole.

Objects of my present invention `are to provide blades having a more effective cutting formation than heretofore; to provide means for taking up wear, when the blades become worn, whereby the cutting edges of the blades will always properly engage the edges of the hand hole; to provide means for closing the space between the rotary head and the stationary support, which on the blades; to provide means whereby the stationary support will firmly engage different hand holes of approximately the same size and shape, but which may not always be exactly the same; to provide a more effective formation of the gripping lingers by which the structure as a whole is held in place and drawn outward to bring the blades into proper engagement with the edges of thehand hole; and to providecertain combinations and details of construction tending to'inorease the general eiiiciency and serviceability of a scraper of this particular character. I'

To the foregoing and other useful'ends, my invention consists in matters. hereinafter set forth and claimed.

In the accompanying drawings Figure 1 is a side elevation of a hand hole scraper embodying the principles, of my invention, showing the p adjacentcportions of the boiler in section, and showing the device clamped in positionto scrape the edges or marginal portions of the hand hole, the shank of the handle being shownbroken away for convenience of illustration.

Fig. 2 is an inside end view'of the scraper h 4in Fig. 5. county, Illinois, have invented a certain new 'manner in which the end of shaft. For example, p 'vided with a cross rpin a adapted to engage notches al formed in the shaftcan beheld against endwise displacement in an outward direction by a cap A:the shaft. A round the inner surfaces of vided with radial slots f in which the rolland adjacent portions ofthe boiler shown `1n Fig. l. a citizen of the United States of Fig. 3 is a reduced `section on line 3--3 Fig. 4 is a similar section on line 4--4 jin Fig. 5.

F ig. 5 is a central longitudinal sectional View of the device shown in Fig. 1, on an enlarged scale. y

Fig. 6 is a fragmentary view of the cen tral portion of the scraper structure, showing thecap removed, `and illustrating the the shaft is connected by a cross pin with the headwhich carries the cutting blades. A

Fig. 7 is a perspective of one of the Scraping or cutting blades.

ig., 8` is a detail fragmentary sectional `view showing one of thespring devices by y which the stationary support is held firmly in the hand hole, and which takes care of -slight variations in the size and shape of the hand holes, thereby preventing looseness when theoval shaped supporting plate does not litany space is necessary for taking up the wear particular hand hole. As thus illustrated, my invention comclearly in B is procarried on the scrapsurface `of the rotary head E, which latter is secured in any suitable manner to the said the shaft can be prosaid rotary head,` and el secured to said head, covering the end.` of plate F bears against said blades, and is proers 1 move back and forth when the shaft lis rotated. Inorder to take up wear, `some space is left between the plate F and the sta- I tionary supporting plate B, a

springy or resilient plate G is intersposed between the two plates, `to occupy said space, this iiller platehaving a iiange g that closesthe said l the hand h space at the outer edge of the plate F at all times. This is for tral portion of the ller plate Gr is bulged outwardly, whereby the outer edges of this plate always bear against the plate B, -so that the flange g always closes the space between the plates F and B, thereby preventing the scrapings from entering said space, As a` matter of special improvement, each blade has an outer angular flange o r cutting portion all which bears upon the oval surface surrounding the hand hole. It will be seen that these portions Z1 of the blades, which latter may be of vany suitable number (two being shown in the drawings), are'dis- 4posed lat such an angle that they produce a shearing cut on the surface of the edges of v p l le, thus more effectively scraping and cutting away the hard substances which invariably form on the seat of the hand holefthat is to say, on the oval surface which forms a seat for the hand hole plate. Also, as shown, the plate B `is provided with radially disposed clamping ngers H which are movable vtoward and away from the axis of rotation, being seated in radial guides formed in the said plate. These fingers, it will be seen, slide over the outer edge of the hand hole to hold the scraping blades against the inner surface or seat of the hand hole, and for this purpose the ngers are preferably ,beveled at their outerA ends, and their Ybeveled surfaces are provided with grooves or channels h, the sharp ridges between these grooves or channels cutting into the edge of they hand hole when the fingers are forcibly moved away fromthe shaft.

.For this adjustment ofthe fingers a rotary cam vplate I is provided, having eccentric grooves z', each groove engaging a pin il on one of said fingers, it being observed that these fingersare four in number. rThis cam plate I is rotated by a crank handle 2 con nected thereto by a sleeve on the handle or in any suitable manner. The collar J is loose on the shaft, it being observed that the only things which are fixed to the shaft are Vthe rotary head E and the collar K,

whichV latter is secured to the shaft in any suitable manner. A spring L is interposed between fthe collars J and K, at the front of the tool head, and in this way said spring serves constantly to pull the rotary head toward the plate B. In other words, tlis spring has a constant tendency to cause the ,blades D to move toward the fingers H,

whereby said blades always bear hard against the oval seat around the hand hole, and wear on the edges of the blades is automatically taken up. If the boilerplate C is thick, the springL will be compressed to allow the blades D to move Vslightly away from the fingers H-that is to say, tof permit the plate Bi to move outward sufficiently to enable the fingers H to slideinto engaging the reason'that the cenposition on the outer surface of the boiler plate. The plate M is secured in place upon the plate B to hold the fingers H and the cam plate I against displacement.' The outer edge of the plate B is provided at intervals with springs N which engage the edges of the hand hole, and which are backed by spring pressed pins n, whereby these flexible portions N are pressed tightly against the edges of the handhole. This, it will be seen, enables the plate B to hold itself against lost motion in hand holes which are approximately the same in size and shape, but which are not exactly the same, and which vary to some extent. For example, if the scraper is inserted in a hand hole which is of such a size and shape that the plate B does not ,tightly and accurately fit the edges of such hole, whereby, and without some provision to the contrary, the scraper would wabble or shift sidewise during the scraping operation, the springs N take up the lost motion, and by engaging the edges of the hand hole prevent or greatly reduce the inclination of the scraper to shake or wabble around in the hole.

From the foregoing it will be seen that I provide a scraper which can be used for cleaning the seat around the edge of an oval hand hole such as those with which certain types of boiler are provided. The blades, by reason of their peculiar formation, very effectively cut away the substances which accumulate around the edges of these boiler hand holes. By reason of the spring L and the variable space between the plates B and F, the blades always bear hard upon the surface to be cleaned, regardless of the extent to 'which the blades have been `worn, and regardless of the variation in the kthickness of the boiler plate.

.ance of the structure lcan be made of iron or steel, although the plate G is preferably of brass. The shaft A can be rotated in any suitable manner, after the scraper is secured in the hand hole, as by a handle O secured to the outer end of said shaft.

I do not limit myself to the exact construction shown and described.

What I claim as my invention is 1. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on Said shaft, one or more blades carried on said head, and va filler between said head and support, permitting movement of said head toward the support to take up wear on said blade or blades, faces thereof. g

2. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the sup.- port Vto take up wear on said blade or blades, disposed between the opposing surfaces thereof, and a spring on said shaft, tending to draw the head toward said support.

3. A scraper lcomprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the support to take up wear on Said blade or blades, disposed between the opposing surfaces thereof, and spring devices for the said support, disposed on the periphery thereof, providing engaging portions which are movable toward and away from said shaft.

4f. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the support to take up wear on said blade or blades, disposed between the opposing surfaces thereof, and clamping lingers for said support, extending beyond the periphery thereof, movable toward and awayfrom said shaft, each finger having a grooved engaging surface.

5. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the support to take up wear on said blade or blades, disposed between the opposing surfaces thereof, and a spring exerting its tension on said head and support to take up wear.

6. A scraper provided with a blade having a cutting flange disposed with its edge at an oblique angle to the direction of travel thereof, to produce a shearing cut on the surface to be cleaned, a head on which said blade is mounted and a shaft for rotating disposed between the opposing sursaid head, said cutting edge being disposed at an oblique angle to a line radial to said shaft, and in a plane at right angles to the' `formed with another cutting edge for cleaning a surface disposed at an angle to said other surface.

8. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the support to take up wear on said blade or blades, disposed between the opposing surfaces thereof, said ller comprising a resilient plate having a flange extending along the outer edge thereof.

9. A scraper comprising a stationary support, a shaft extending through said support, a rotary head on said shaft, one or more blades carried on said head, and a filler between said head and support, permitting movement of said head toward the support to take up Wear on said blade or blades, disposed between the opposing surfaces thereof, said filler comprising a plate having a springy bulge at the center thereof, around said shaft, and provided with means for preventing the scrapings from entering between said surfaces.

l0. A scraper comprising a rotary cutting head, a support therefor, means for providing a variable space between said head and support, and means for closing said space to prevent the admission of scrapings thereto, constructed and arranged to automatically adjust itself to variations of said space.

Signed by me at Chicago, Illinois, this 29th day of January, 1914.

GIDEON PILLOW BROWN.

W'itnesses ARTI-Inn F. DURAND, RACHEL J. RICHARDSON.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents, Washington, ID. C. 

